Valve-grinding mechanism.



E. CASNER. vALvE GRINDING'MEGHANISM.

APPLICATION FILED SEPT.28, IBIS.

l 9224,06? Patented Apr., 24, 1917.

EARL CASNER, O F CARTHAGE, MISSOURI.

VALVE-GRINDING MECHANISM. f

Specification of Letters Patent.

Patented Apr. 24, 1917.

Application led September 28, 1915. Serial No. 52,998.

To Vall 'whom t may concern.:

Be it known that I, EARL CAsNnn, a citizen of the UnitedStates, residing at Carthage, in the county of Jasper and State of Missouri, have invented certain new and useful Improvements in Valve- Grinding Mechanism, of which the following is a specification.

This invention relates to valve grinding machines, and has for its object to produce an improved machine or apparatus of this kind that is adapted to be secured to an engine, the valves of which are to be ground, and to simultaneously oscillate the valves while seated to effect a grinding thereof. In the accompanying drawings I have illustrated av machine embodying my invention in its preferred form, the machine therein illustrated being adapted to simultaneously grind four valves of an internal combustion engine of well known type and construction. It will be understood that the invention is not limited in its useful applications to the specific machine illustrated, as the parts thereof may be variously proportioned and arranged to suit the particular engineupon which it is to be used, or the parts maybe so adjustably supported as to adapt the machine to use 'upon engines of dilferent sizes and makes.

Referring to the. drawings- Figure 1 is a front elevation of the machine detached, part of the operating handle being broken away; l

Fig. 2 is a top plan view of the machine;

Fig. 3 is a side elevation thereof;

Fig. 4 is a vertical section taken on the une Iv-iv of rig. 1;

Fig. 5 is a horizontal section taken on the line V-V of Fig. 4; and

Fig. 6 is a detail perspective view of one of the parts of the machine to be hereinafter described. i

In the drawings 2 indicates the base or supporting frame adapted to be secured to the frame of the engine the valves of which are to be ground by the machine; and 3 indicates a swinging frame pivotally united with the base frame by pivots 4, and carry ing the operative valve grinding parts of the machine. The baseframe consists essentially of the parallel end pieces 2', 2' rigidly united in any suitable manner, as by the connecting bar 5. The end pieces 2' are represented as being providedwith perfoways 8 in which is mounted a rack bar 13, to.

be described. I employ a clamp for uniting the base and swingingl frames in working position, as indicated in Figs. 1 and 4. This clamp preferably consists lof a bar 9 pivoted at 11, 11 to thev end pieces 2 of the base frame, and provided with hooks 10 adapted to engage with the cross plate 7 of the swinging rame when the latter is broughtdown substantially parallel with the base frame vinto working osition. Springs 12 act upon the clamp to orce the hooks thereof into position-to engage with the cross plate of the swinging frame and to securely hold the clam-p in working position. 19 indicates a top plate supported by pins 20 above and parallel with the cross plate 7 of the swinging frame. `The upper ends of the pins 2O are screw-threaded and adjusting nuts 22 are mounted on such threaded parts.

A series of rotatable spindles 18, there being four of them in the machine being scribed, are supported in the plates 7 and 19 ofthe swinging frame, and carry at their lower ends tools for engagingwith the valves to be ground. These toolslare represented as being heads 23 carrying pins 24, but other forms of tools may be substituted therefor if found desirable. Upon-each spindle 18 is secured a. pinion 17 with which engages the rack bar 13. The rack bar is con- ,nected by a link 16 with an operating lever 14 pivoted in the bracket 15 carried by the swinging frame. It will be readily seen that if' the rack bar 13 be reciprocated, through the manipulationof the handle 14, the spindles 18 will be oscillated, and, if the tools which they carry are in proper engagement with the valves of the engine, the latter will be oscillated in their seats and ground.

21, 21 indicate coiled springs surrounding the spindles 18 and interposed between the upper plate 19 and the pinions 17. They operate to hold the valve-engaging tools in engagement with the valves, with yielding force.

Associated with the spindle of each valve grinder is a cam, adapted, during the oscillation of the spindle, to cause it to be longitudinally reciprocated. Most of the valves y of engines upon which the machine being devsis scribed is adapted to operate, are springseated, and when the valve-engaging tools are brought into engagement therewith androtated, the valves are held, by the springs 21, against their seats and in grinding engagement therewith. But by the use of the cam devices referred to, afterthe spindles have been rotated to a certain extent, as for instance about a revolution and a quarter, the cam devices come into operation and cause the oscillating spindles to be moved, against the action of the springs 21, with the result that the valves are lifted slightly from their seats, permitting any dirtor particles that may have become loosened by grinding to drop away, and also permitting abrasive material to be fed under the valves.

The cam device that I prefer to employ is illustrated in detail in Fig. 6 and consists essentially of a sleeve 25 loosely surrounding the spindle 18 and located between the plate 7 and the pinion 17. The sleeve is provided with a cam 26 and a lug or projection 27. A radially disposed pin 29 is seated in the spindle 18 and is adapted to engage with the upper edge of the sleeve 25. A pin 28 is l seated in the plate 7 in position to be engaged by the lug or projection 27 carried by the sleeve.

It will be observed that the means that I employ for periodically moving each spindle longitudinally as it is being oscillated are disposed concentric with the axis of rotation of the spindle, and that one of the parts that effectsthe longitudinal movement of the spindle, the pin 29 that engages with the cam 25 in the arrangement herein disclosed, is carried directly by the-spindle. This arrangement of parts tends to simplicity of construction and compactness in the location of the parts of the machine besides making an apparatus that is not liable to get out of order or become inoperative through long use and wear.

-The operation of the machine described is as follows: The base frame 2 is secured to the engine the valves of which are to be ground, in position to permit the heads 23 to engage with the valves when the frame 3 is swung down into working position as indicated in Figs. 1 and et. It will be understood that the necessary parts of the engine are removed to expose the valves before the grinding machine is put in place. The heads 23 being in engagement with the valves and the frame 3 clamped in working position, the handle 14 is reciprocated and maine?` ries in engagement with the upper edge of the cam sleeve 25. As the sleeve is loosely supported it turns with the spindle until positively arrested by the engagement of the lug 27 with the pin 28. When this takes place the spindle turns relative to the sleeve and the pin 29 rides up the inclined surface of the cam 26, lifting the spindle, compressing the spring 21, and permitting the valve to separate from its seat, as has been described. Upon the reverse movement of the rack bar the rotation of the spindle is reversed aiid immediately the pin 29 rims down the cam 26, allowing the valve to come to its seat, after which further rotation of the spindle causes the sleeve 25 to turn with it, allowing the valve grinding action to take lace. p The force with which the valves are held against their seats during the grinding operation may be varied by means of the adj'ustingnuts 22, for if they be screwed downy upon the pins 20 the springs 21 will be -coinpressed and their tension increased, as will be readily seen. v

What I claim is:-

1. In a valve grinding machine, the combination of a supporting frame, a set of rotatable spindles adapted to be connected with the valves to be ground, means for oscillating the spindles, springs acting respectively upon the spindles for holding them in engagement with the valves with yielding force, and means for varying the tension of all the said springs substantially simultaneously and equally at will.

2. In a valve grinding machine, the combination of a movable frame having astationary plate, a. movable plate supported parallel lwith and spaced from the said stationary plate, a set of spindles carrying tools adapted to engage with the valves being ground, supported in the said plates so as to be rotatable therein and also longitudinally movable therein, springs acting upon the said spindles and bearing against the said movable plate adapted to hold the valve-engaging tools to their work ,with l yielding force, and means for adjusting the said movable plate to vary the tension of the said springs. i

.3. In a valve grinding machine, the combination of a rotatable and longitudinally movable spindle adapted to be connected with a valve for grinding it while seated,

means for means for oscillating the spindle, holding the spindle against the valve to be ground with yielding force, and means disposed concentric with the axis of rotation ofthe spindle for positively moving the spinlle longitudinally as it is being oscillate 4. In a valve grinding machine, the combination of a rotatable and longitudinally movable spindle adapted to be connected with a valve for grinding it while seated, means for oscillating the spindle, means for holding the spindle against the valve to be ground yWith yielding force, and means disposed concentric with the axis of rotation of the spindle and arranged to cause the spindle, while being oscillated, to be turned without longitudinal movement thereof, during a portion of its period of oscillation, and to positively cause it to be moved longitudinally during another portion of its oscillation.

.with the valve with yielding force, means for oscillating the spindle, a sleeve surrounding the spindle and having its edge formed into a cam, and a pin carried by the spindle and adapted to engage the edge of the said sleeve and to ride upon the said cam to cause longitudinal movement of the spindle as itis oscillated.

7. In a valve grinding machine, the combination of a rotatable spindle carrying a valve-engaging tool, means acting on the spindle for holding the tool in engagement with the valve with yielding force, a loosely supported sleeve surrounding the spindle and adapted to turn therewith and carrying a cam, aprojection extending out from the spindle and adapted to rest-upon the sleeve to cause it to turn with the spindle and also adapted to ride upon the cam to move the spindle longitudinally, and means for stopping the rotation of the sleeve with the spindle to cause the pin to traverse the cam.

8. In a valve grinding machine, the combination of a rotatable spindle carrying a valve-engaging tool, a springacting upon the spindle for holding the tool in engagement With the valve With yielding force, means for oscillating the spindle, a sleeve loosely supported and surrounding the spindle provided on its edge with a cam and carrying a projecting lug, a projection carried by the spindle and adapted to engage with the edge of the sleeve and to ride upon the cam thereof, and a stationarypstop with which the said lug of the sleeve engages, whereby its rotative movement with the spindle is arrested.

EARL CASNER.

copies of this patent maybe obtained for ve cents each, by addressing the Commissioner of `Patents,

Washington, D. C. 

